Using high-carbon steel , wear-resistant , wear-resistant , and long service life of Application : It can be used for installation on tools with shapes such as pneumatic screwdrivers , electric screwdrivers , air drills , electric drills , and manual screwdrivers Unique Design : the anti-dropping steel ball is better fixed : the self-locking device is not easy to slip or fall off and cause situations design , greater bearing capacity Usage : suitable for screwdriver handle or electric screwdriver tool ( three-jaw chuck ) to drive the sleeve After installation , the joint can be converted into a square for head , which can be used for the installation of the sleeve A powerful tool for conversion 3 / 8 " Extension Drill Bits Bit Set Power Tools, Manufacturer: OSNIYAW